The newest trailer for "Avengers: Endgame" reflects on the Avengers' past.

Scenes from a number of movies in the Marvel Cinematic Universe are shown throughout the trailer as the world's heroes prepare to undo Thanos' utter decimation of the universe's population. From 2008's "Iron Man" to "Captain America: The First Avenger," the scenes show some of the Avengers before they became the heroes of today.

Here are all of the movies from the MCU that are featured in the trailer.

"Avengers: Endgame" hits theaters Friday, April 26.

The trailer opens with a scene from 2008's "Iron Man."

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"It seems like 1,000 years ago. I fought my way out of that cave, became my own man," Tony Stark says in a voice-over as the trailer opens.

The first scene shown in the trailer is Stark in the Afghanistan desert in his first Iron Man suit. He crashed after escaping from the cave where he was held by terrorists.

The next scene is also from the first "Iron Man."

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Tony opens a wrapped gift from Pepper Potts in the first "Avengers" movie. She gives Tony his old arc reactor in a box with an engraving that says, "Proof that Tony Stark has a heart."

A clip of Pepper is from 2013's "Iron Man 3."

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Pepper finds an Iron Man mask in the destroyed remnants of their home and puts her face to it. The mask begins to beep and Pepper puts it on to hear a message from Tony.

The United States Armed Services Recruitment building is from 2011's "Captain America: The First Avenger."

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Steve Rogers wants to join the Army, so he goes to a recruitment center.

The next scene shows Steve when he enters the building.

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A mirror is supposed to show a soldier what he would look like in uniform, but Steve is too short to see himself fully.

Peggy Carter, Steve's love, can be heard in a voice-over saying, "None of us can go back. All we can do is our best, and sometimes the best that we can do is to start over." She says that line in "Captain America: The Winter Soldier" when Steve visits her in her old age.